of flint



March 8, 1932. A. G. REDMOND FUEL FEEDING SYSTEM FOR MOTOR VEHICLESFiled April 30, 1 25 Fatented Mar, 8, 1932 UNITED STATES PATENT OFFICEALBERT G. REDMOND, OF FLINT, MICHIGAN, ASSIGNOR T MARVEL CARBURETER COM-PANY, OF FLINT, MICHIGAN, A CORPORATION OF INDIANA FUEL FEEDING SYSTEMFOR MOTOR, VEHICLES Application filed April 30 1925. Serial No. 27,114.

This invention relates to a fuel feeding system for motor vehicles andis a companion application of my application filed even date herewith,patented Nov. 13, 1928, #1,691,128, the object being to provide a fuelfeeding system in which a diaphragm pump is 0 erated V by a, forced feedlubricating system 0 the internal combustion engine, whereby I am ableto utilize the pressure from the lubricating system of .the engine foroperating a pump for raising fuel from a low level tank to a receivingchamber arranged above the charge forming device of the engine.

Another object of my invention is topro- 1B vide means for venting thereceiving chamber when the electric startlng motor for the inter: nalcombustion engine is operated to start the engine.

Another and furtherobject of the invention is to provide a relief valvefor the pumping mechanism so that when the ressure exceeds a certaindegree, the fluid W111 be returned to the suction line of the pumpthereby preventing the flooding of the charge forming device.

Other and further objects and advantages of the invention will behereinafter set forth and the novel features thereof defined by the apended claims.

n the drawings,- 7

Figure 1 is a side elevation of an internal combustion engine showingdia rammatically my improved construction of fuel feeding systemthereto;

Figure 2 is a vertical section through the pumping mechanism; and

Figure 3 is a vertical section through the receiving tank and circuitmaker and breaker for the electric starter.

In the drawings 1 indicates an internal combustion engine, 2 a chargeforming device having the usual float chamber, 3 an air-tight receivingchamber constructed substantially.

as shown in my patent aforementioned and i having an air inlet 4 closedby a valve 5 formchamber 14 into the suction line of the pump ing thecore of the solenoid 6 which is arranged in electric circuit having asource of current in the form of a battery 7, the circuit maker andbreaker 8 being disposed in said circuit for controlling the flow ofelectrical energy to electric starter 9, which is provided with a pinion10 adapted to engage the toothed fly wheel 11 of the motor for startingthe same.

The receiving tank 3 is connected to the float bowl of the earbureter bya pipe 12 and is provided with a pipe 13 extending from a valve chamber14 in which is mounted a check valve 15 for closing the outlet port of achamber 16, which is provided with a check valve 17 controlling theinlet port from which extends a pipe 18'fron1 a low level reservoir 19disposed at any suitable place preferably at the rear of the motorvehicle.

The chamber 14 is provided with an outlet 20 extending to a chamber 21in which is moimted a spring pressed relief valve 22 and from thischamber extends pipe 23 to the pipe 18 so that fuel can flow back fromthe as will be hereinafter fully described.

Secured to the casting forming the chambers 14 and 16 is a cup-shapeddisc 24 to which is connected a cup-shaped disc 25 between which arearranged a series of fabric discs 26 formed impervious to gasoline andoil forming a diaphragm pump. The disc 25 is provided with an extension27 terminating in a valve casing 28 in which is mounted a snap valve 29having a central opening 30 surrounded by a coil wire ring 31, throughwhich extends a double conical enlargement 32 formed on a rod 33, whichextends through the flexible disc and is secured to disc 34 carriedthereby, said rod being surrounded by a coil spring 35, the end of therod working in a bore formed in the casting forming the valve chambers14 and 16.

The chamber formed by the cup shaped 90 discs 24 and 25 is incommunication by a passage 36 with the valve chamber 16 so that as thediaphragm is workedback and forth, gasoline will be drawn into thechamber of the diaphragm pump on the suction stroke and forced outthrough said passage i0 as to deliver fuel to the receiving cham- Inorder to utilize the pressure of the forced feed lubricating system ofan internal combustion engine for operating the diaphragm, I provide thevalve casing 28 with ports 37, 38, 39. and 40 which are adapted to beopened and closed by the valve 29 as will be later described.

The ports39" and 40 are connected to open- .ings formed in thecup-shaped disc 25 by pipes 41 and 42 and the p'ort'37 is connected tothe pump line of the lubricating system by a ipe 43 so that lubricantunder pressure will e forced into the chamber 28 when the valve isopened. 7

The outlet port 38 of the valve casing is connected to the crank case bya .pipe 44;: so that lubricant is returned to the crank case afterpassing into the pump chamber to operate the diaphragm. When the valve29 is in the position shown, the pressure of the oil in the lubricatingsystem of the internal combustion engine is against the side' of theflexible disc so as to force the diaphragm to the right so as tocompress the s ring and as the diaphragm moves to t e rlght, it carriesthe rod 33 with it so that the double enlargement rides through thevalve andthe valve snaps or rides over the double conical enlargement soas to out off the inlet ort 37 and the outlet port 39. The pressure eingreleased, the spring 35 which has been com ressed on the dischargestroke of the flexi 1e diaphragm returns the diaphra m into the positionshown so that the dou le conical enlargement rides through the openingof the va ve and the valve is moved into position to close the ports 38and 40 and open the ports 37 and 39, the fluid which has been drawn intothechamber to the oil side of the diaphragm being forced out through.the port 38 to the crank case and the gasoline is sucked from the lowlevel tank into the chamber on the opposite sideof the diaphragm so thatwhen the diaphragm is placed in communication with the lubricatingsystem, the pressure exerted thereby will force the diaphragm todischarge the liquid therefrom and force it to-the receiving chamber 3.

This is repeated on each suction and discharge stroke of the piston sothat fuel is constantly being supplied to the receiving chamber. Whenthe pressure of the fuel exceeds the predetermined pressure, the reliefvalve opens so'that the fuel instead of being forced to the receivingchamber is allowed to return to the suction line of the pump.

provided with a valve which is automatically opened when the circuit isclosed to supply electrical energy to the starting,

motor.

In order to provide means for venting the chamber arranged above thecharge forming device when used in connection with a motor vehicle notemploying an electric starter, I use an electric circuit X having aswitch so that when the switch is closed, the solenoid is energized andthe valve is opened in order to allow fuel therein to flow by gravity tothe charge forming device.

While in the drawings I have shown certain details of construction ofthe pump, I am fully aware that many changes can be made withoutdeparting from the spirit of my invention.

' What I claim is 1. A diaphragm pump comprising a sectional casinghaving a diaphragm arranged between the sections forming a chamber toeach side thereof, one chamber being in communication with the source ofsupply and source of consumption, one section of said casing is providedwith a projection terminating in va valve casing having an inlet and anoutlet in communication with the other chamber of said pump, said valvecasing having an inlet and an outlet, a valve slidably mounted in saidvalve casing for intermittently opening and closing said inlet andoutlet, said valve having a central opening surrounded by a coil wirering, a piston rod slidably mounted in said PI'OJGCtlOIl extendingthrough said diaphragm and connected thereto having a double conicalenlargement at one end working through saidcoll wire ring and adapted tomove said valve in said valve casin to intermittently open and close therespective inlets and outlets, and a coil spring surrounding said istonrod within said casing for moving sai diaphragm in one direction.

2. A diaphragm pump for fuel feeding systems of internal combustionengines comprising a pair of cup shaped discs having a flexiblediaphragm arranged between the same forming a chamber to each sidethereof, one of said discs being provided with a lateral project-ionterminating in a valve casing having a removable cover, a valve casingsecured to the other end of said discs having inlet and outlet valves,said valve casing being provided with a relief valve, the other chamberof said pump being provided with inlets and outlets in communicationwith the first mentioned valve casing, said last mensignature.

ALBERT G. REDMOND.

